5 Mistakes to Avoid When Planning a Minor Dwelling in NZ

Adding a granny flat or tiny home can be incredibly rewarding but avoid these common mistakes if you want a smooth ride.

1. Skipping a Feasibility Check

It’s tempting to dive straight into design ideas (Who doesn’t love a good Pinterest session!!), but not every property is ready for a minor dwelling. A feasibility check helps you avoid wasted time and money by confirming what's actually possible on your land.

• A proper feasibility check will look at zoning rules, site access, utilities, and service connections.
• It can also highlight whether resource or building consents will be needed—and what that process could cost.
• Investing in this early step gives you clarity before committing emotionally or financially.

Think of it as checking the weather before heading out for a hike—you’ll be glad you did.

2. Underestimating Site Challenges

Steep slopes, tight access, and drainage issues can add unexpected costs and delays. Take the time to assess your site thoroughly before committing to a build.

• Ask: Can a truck deliver a prefab here? Is there space for turning, cranes, or site equipment?
• A geotechnical report or site survey can uncover ground stability issues or flood risks.
• Consider stormwater runoff and how that might impact your neighbouring properties.

What looks “buildable” to the untrained eye could be hiding big obstacles just below the surface.

3. Not Understanding Zoning or Rules

Each council in NZ has its own rules around minor dwellings. Failing to research local zoning can stall your plans or, worse, result in fines and required removal of your build.

• Key things to check: minimum site size, maximum dwelling size, distance from boundaries, and number of dwellings allowed per site.
• Talk to your local council or engage a planning consultant (hello.. that's me!) if you're unsure—it could save you months of backtracking.
• Even relocatable tiny homes can fall under building consent requirements, depending on their connections.

“But it’s on wheels!” isn’t always a valid exemption.

4. Choosing the Wrong Builder or Prefab Path

Not all builders are experienced in minor dwellings. Whether you’re going prefab or custom, make sure your builder understands the unique constraints and compliance requirements of tiny or secondary homes.

• Look for builders who have completed consented tiny homes or minor dwellings in your region.
• Ask for references and past client reviews—especially from those who’ve had to go through council approvals.
• Ensure your builder’s plans are fit for your site, not just a “one-size-fits-all” template.

You want a partner in the process, not someone learning on your job.

5. Ignoring the Long-Term Functionality of the Space

Think ahead. Will the space still work for you in 10 years? Is it adaptable for aging parents, adult children, or rental income? Smart planning now prevents future limitations.

• Can the layout be reconfigured later? Would adding a deck, storage pod, or second bedroom be possible down the line?
• Consider universal design principles like wider doorways, step-free access, and future-proof bathrooms.
• Will power, water, and waste systems cope with changing or increased use?

Your life will evolve—make sure your tiny home or granny flat can grow with you.

The right knowledge early on can prevent thousands in unexpected costs.

That’s why Tiny House Mastery offers one-on-one consults and planning support — so you can move forward with confidence, avoid costly mistakes, and make the most of your land.

Want help getting started?
Book a planning session today and let’s map out your next steps together.